Propafenone SR Side Effects

Common Side Effects

Propafenone SR has been studied extensively in clinical trials. In these studies, the side effects that occurred in a group of people taking propafenone SR were documented and compared to the side effects that occurred in a similar group of people taking a placebo (a "sugar pill" that does not contain any active ingredients).
The prescribing information for most prescription medications contains the exact percentage of people who experienced problems. However, the prescribing information for propafenone SR contains only general percentages. Therefore, it is difficult to know exactly how often certain side effects may occur.
In clinical studies, the most common propafenone SR side effects, occurring in more than 5 percent of people, included:
  • Dizziness
  • A fast or irregular heartbeat
  • Chest pain
  • Breathing difficulty
  • Changes in taste, such as a metallic taste in the mouth
  • Nausea
  • Fatigue
  • Feeling anxious
  • Constipation
  • Upper respiratory tract infections, such as the common cold
  • Swelling in the body, such as in the arms, hands, legs, ankles, or feet
  • Flu-like symptoms.
Other common side effects, occurring in at least 2 percent of people, included:

Final Thoughts

You may experience some or none of the propafenone SR side effects listed in this article. Unfortunately, there is no way for your healthcare provider to know beforehand if you will have problems with a medicine that you have never tried.
Therefore, make sure to let your healthcare provider know if you develop any side effects while taking propafenone SR or if something "just does not seem right." While it may not be related to the medication, your healthcare provider will be able to diagnose and treat the problem.
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